Paper making machine



Sept. 1, 1931. A. SCHUBERT PAPER MAKING MACHINE Filed June 20, 1929 lnvan/ ol";

A RTHUR 5(HUBER T Patented Sept. 1, 1931 ARTHUR SCHUIBERT, oF RossLAU,GERMANY PAPER MAKING MACHINE Application filed June 20, 1929, Serial No.372,348, and in Germany February 3, 1928.

My invention relates to electrically opertemporarily displacingangularly said guide roller from its neutral position in cases when theendless sieve deviates laterally from its proper straight-forward pathof travel.

One of the objects of my invention is to for the purpose set forth, theelectrically operated switching gear of which can be fixed as a unit atany convenient place outside the paper machine proper, preferably abovethe latter where they do not obstruct the supervision of the machine andare safer against destructive attacks through moisture, noxious vapors,short-circuiting, etc.

A further object of my invention is to design an automatic electriccontrolling device for the purpose described which is "foolproof, thecurrent carrying joints being protected by a cover, and which can besafely manipulated by hand whenever required in cases of emergencynotentailing danger, accruing fromhigh voltage currents to the life andhealth of the attendants of the paper Y the supervision: of the machlneand caused machines. l

The invention also aims at providing means at the controlling device bywhich the travelling endless sieve of paper machines will haveimpartedthereto deliberate lateral 0scillatory movements within certainadjustable limits, in order to reduce wear and tear of the sieve and itscooperative parts of the paper machine such as suction boxes,pulpfeeding regulators etc., viz. by spreading out the points of mutualcontact over larger surfaces. h

Further objects of my invention will incidentally appear hereinafter:

The nature and' scope of my invention is briefly outlined in theappended claims and will be more fully understood from the i 1- providean improved controlling apparatus lowing specification taken togetherwith ac-v companying drawings in which Fig. 1 1s a dlagrammatlc frontelevatlon of a paper machine furnished with an electric lines thedifferent positions into which the guide rollerIfor mechanicallycontrolling. the course of travel of the sieve may be angularlydisplaced by a screw drive,

Fig. 4 drawn in a larger scale shows the electric switching andactuating mechanism cooperating with the guide roller shown in Fig. 3. aExtensive experiments have been made by the inventor with electriccontrolling devices for the purpose concerned, the electric motorofwhich for angularly displacing the guide.

roller and the whole number of its accessorial elements, starting andswitching means, sliding bars, contact fingers etc., carryinghighvoltage current, were arranged at the frame proper of the papermachine close to said guide roller, where they were exposed to the riskof being damaged by short circuiting and corrosion through moisture,noxious gases etc., issuing from the machine and the web underformation; and where they obstructed danger to the attendants.

The said drawbacks have been eventually eliminated in and by theimproved automatic controlling device described hereinafter:

Referring to Figs. 1-3 two conically shaped contact rollers 4, 4" arerotatably mounted on adjustable stands 5, 5', the latter being arrangedunderneath the endless sieve 2 of the paper machine, one at each side ofthe latter; the edges of the sieve 2 will come I into frictional contactwith one of said rollers 4 or 4 in cases when thesieve deviates from itsnormal path of travel, viz. going astray to one side; and through thesaid frictional contact the respective roller 4 or 4' is swung aroundits axis, thus operating an electric switch, (not shown) and closing anelectric auxiliary circuit.

Counter-weights, indicated at 6, 6, are ex centrically arranged withinthe said rollers by which the latter are automatically swung back intotheir inoperative position after the sieve 2 has gone out of contactwith the respective roller.

The path of travel of the sieve 2 is controlled by a guide roller 1,known per se in the art, over which the sieve runs andwhich is adaptedto be angularly displaced from its neutral position by means of a screwand nut gear 3 and a chain pulley 7; a hand wheel 8 being also attachedto the screw spindle concerned for attendance by the machine operatorsin cases of emergency.

In contradistinction to the arrangements made by the inventor in hisearly experiments the electric actuating mechanism for automaticallycontrolling the position of the guide roller 1 and in turn the path oftravel of the endless sieve 2 is arranged outside the (not shown) thelatter being attached to and depending from a protecting hood 23, whichis fixed to the bottom plate 22 of the electric motor 20. Flanges 24,24' are provided at the lower end of the hood 23 from which a tank 25containing oil and having corresponding flanges 26,26 is detachablysuspended by clamping means such as screw bolts, hooks, etc. (not shown)thus the electric switching gear, being constantly immersed in an oilbath is effectively insulated and protected against short circuiting andcorroding attac s through moisture, vapors, etc. A threaded spindle30,engaging a threaded cross head 31, is rotatably mounted within the hood23 and is adapted to shift the cross head 31 to and fro, as indicated bythe arrows w, :0 said cross head 31 being slidably arranged on guidebars 32, 32, which are fixed on brackets 33, 33. At the outer end of thespindle 30 there is a hand wheel 34 snugly fitted, having a chain pulley35 attached to it. A detachable pin clutch 36 is provided forcooperatively interconnecting the said chain pulley 35 with anotherchain pulley 35 which 1s rigidly mounted on the spindle 30 and isrotated by chain 21'.

It should be noted that while the screw and nut gear 3 is normallyoperated by power viz. by the electric motor 20 through chains 21, 21,it may be operated independently of the motor by hand, viz. througheither handwheel 34 or 8 after clutch pin 36 having beenwithdrawn,-whenever it may be necessary to readjust or to change theoperative position of the guide roller 1 relatively to the cross head-31for special purposes explained hereinafter.

As a matter of fact the movements of the cross head 31 which is,cooperatively interconnected through chain 21 with the screw and nutgear 3 of the guide roller 1 exactly correspond with the movements ofthe latter: viz. the cross head 31 representing a repetition in areduced scale of the nut carrying with it the guide roller 1.

A disc 40 having horn shaped extensions is pivotally mounted underneaththe cross head 31 and is adapted to be swung around its pivot in thedirection of arrows z, z. Said disc 40 cooperated with electric switchescomprising contact levers 43, 43', fulcrumed at 44, 44, and contactmembers 45, 45, the latter being preferably springs or like resi entsupports.

Electromagnetic switch gears 50, 6O operate two sets of switches 51, 51,61, 61' and are electrically interlocked in the manner describedhereinafter.

Arms70, 80 are slidably mounted and ad justably fixed'on the guidebars32, 32 by means of clamping screws, said arms having attached attheir lower ends circuit breakers 71, 81, acting as-safety devices andinter rupting the motor current whenever the cross head 31 approachesone of its extreme. outward positions.

The electric motor 20 is of a reversible type, known per se,diagrammatically indicated by its respective terminals R I, R II, therotor being mounted on a spindle 29'and being adapted to rotate the saidspindle in clockwise or anticlockwise direction.

The rotary movements of the spindle 29 are geared'down and transmittedto the chain lows The endless sieve of the paper machine on deviatingfrom the normal ath of travel and eventually touching one o the contactrollyieldingly supported by 1 ers 4,4 ClOSGSxiLIl electric circuitpreferably carrying low voltage current and thereby operates one of theswitches A I, A II (Fig; 4) by which a high voltage circuit, excitingthe electromagnet 50 or 60 is closed.

The respective exciting circuits are indicated by dash lines,interconnecting the switches A I and A II with terminal boards 90, 90'and with the electromagnets 50, 60.

As soon as one of said electromagnets has been excited-say electromagnet50-the switches 51, 51' are drawn into their upper position in which amotor circuit, indicated in dot-and-dash lines, is closed for the timebeing. p o

The rotating threaded spindle '30 causes the cross head 31 to move inthedirection of arrow as and simultaneously causes the screw and nut gear 3to angularly displace the guide roller 1 with the result that the sieve2 begins to move backward to its normal path of travel and looses itscontact with the contact roller 4.

Hence the dash-line circuit A I, exciting electromagnet 50, isinterrupted and the switches 51, 51 are dropped, thus breaking the motorcircuit R I.

Meanwhile the disc 40, having been swung in the direction of arrow a: bythe cross head 31, has turned the contact lever 43 into its operativeposition in which an auxiliary dash-line circuit, flowing throughcontact member 45 and exciting the other electro magnet 60, is closed.

As soon as the electromagnet has been excited the switches 61, 61' aredrawn into their upper position in which another dotand-dash line motorcircuit, R II reversing the revolution of motor 20 is closed.

Thereupon the spindle 30 will be rotated so as to move cross head 31 anddisc 40 in the direction of arrows at and 2 respectively, returningsame. into their central position. Meanwhile contact lever 43 will dropinto its inoperatve position; concurrently the auxliary dash-linecircuit, exciting electromagnet 60, and thedot-and-dash line motorcircuit R II are broken so that the motor 20 will now stop for good viz.after having returned also the guide roller 1 into its neutral position.

Electrical and mechanical switching operations, correspondingsubstantially to those described above with regard to contactroller 4and switch A I are brought about by the sieve 2 ion touching the contactroller 4' at the opposite side of the machine.

The contact terminals 90, 90' are connected with the main conductors ofthe electric supply system through a switch indicated at '92.

Attention is drawn to an important functional modification for which theimproved sieve controlling device may be used to advantage and whichconsists in deliberately imparting to the endless sieve of the paper.machine oscillatory movements Within certain predetermined limits.

This procedure may be adopted as a precautionary measure in specialcases in as much as the points of contact of the endless sieve withcooperating machine elements, such as feed regulators, controlling thepulp supply, suction boxes etc. are spread out over a broader surface:In this wa excessive wear,

- entailing e, g. grinding o grooves, which be first disconnected fromthe chain pulley 35 by withdrawing the clutch pin 36; whereupon, byturning hand wheel 34 or hand wheel 8 the guide roller 1 is angularlydisplaced and moved from its neutral position, (shown in the drawings)into an abnormal position. It will be noted that while guide roller 1 isdisplaced cross head 31 remains in its centralposition shown in Fig. 4.

Once the guide roller 1 has been angularly displaced it will do its dutyby laterally shifting the travelling sieve 2 until the latter comes intocontact with the respective con-. tact roller 4 or 4, which thereuponwill cause the guide roller 1 and sieve 2 to be shifted backward in themanner described at length hereinbefore. However by reason of thestaggered position of the guide roller 1 relatively to' cross head 31and the electric switches responsive to the latter the guide roller 1will not reach its their component parts may suggest themselves to thoseskilled in the art, without departing from the spirit and the salientideas of my invention.

E. g. instead of electrical gear mechanical means, such as a lever orbalance may be provided for interlocking the electromagnets 50, 60 andthe switches 51, 51', 61, 61 associated with the latter, so that onlyone set of said switches can be operated at a time.

The'oil tank 25'may be detachably connected with the hood 23 throughchains or like flexible members by which the tank may be suspended,after having been lowered into an inoperative position so as tov renderaccessible for supervision and repair the electric switching gear whichnormally is immersed in the oil.

A. window 23' and electric incandescent lamps may be provided in thehood 23 so as to render visible spindle 30 and the cross head 31 for theattendants and keep the latter constantly informed about the properfunctionin of the electric sleeve controlling device.

at I claim is:

1. In an electrically operated apparatus for controlling the path oftravel of the endless sieve of aper 'making machines the combinationwith an angularly displaceable guide roller over which the endless sieveof the paper machine runs, of a primary screw and nut gear adapted topositively control the position of said guide roller, a reversibleelectric motor cooperatively associated with said screw and nut gear andwith an elec-' tric switching device, the latter being responsive tolateral deviations of the sieve, an intermediate screw and nut gearbeing attached to said electric switching device and having across-head, the latter being cooperissues atively associated withadjustably mounted I circuit breakers, a clutch interconnecting theelectric motor and both said screw and nut gears, means for throwingsaid clutch into and out of operation and means for displacing by handthe nut of the primary screw and nut gear independently of the positionof the cross-head of the intermediary screw and nut gear.

2. An electrically operated controlling apparatus for the purpose setforth and having the features outlined in claim 1, in which the electricswitching device is bodily attached to the electric motor so as to formone unit with the latter, said switching evice and electric motor beinginterconnected with the primary screw and nut gear and the inter-'mediary screw and nut gear through endless chains.

3. An electrically operated controlling apparatus for the purpose setforth and having the features" outlined in claim 1, in which theelectricswitching device is arranged in an oil tank, the latter beingcovered by a hood in which the intermediary screw and nut gear ismounted.

4. An electrically operated controlling apparatus for the purpose setforth and having the features outlined in claim 1, in which thecross-head of the intermediary screw and nut gear is guided during itsreciprocating movements by stationary guide bars, the said circuitbreakers being slidably mounted onthe latter so as to be capable ofbeing individuallyadjusted asato their distance from the cross-head,

5. An electrically operated controlling apparatus for the purpose setforth and having the features outlined in claim 1, in which the-saidclutch and means for throwing the latter into and out of operationcomprise a pair of toothedpulleys, coaxially mounted on the main splndleof the intermediary screw and nut gear, one of said pulleys beingloosely mounted the other pulley being keyed to said 5 )indle, and meansfor interlocking said puileys by hand.

6. An electrically operated controlling apparatus for the purpose setforth and having the features outlined in claim 1', in which the saidclutch and means for throwing the latter into and out of operationcomprise a pair oftoothed pulleys, coaxially mounted on the. mainspindle of the intermediary screw and nut gear, one ofsaid pulleys being loosely mounted, the other pulley being

